US2383857A - Ultra high frequency wave coupling device - Google Patents

Ultra high frequency wave coupling device Download PDF

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Publication number
US2383857A
US2383857A US440417A US44041742A US2383857A US 2383857 A US2383857 A US 2383857A US 440417 A US440417 A US 440417A US 44041742 A US44041742 A US 44041742A US 2383857 A US2383857 A US 2383857A
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United States
Prior art keywords
rotor
stators
winding
field
stator
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Expired - Lifetime
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US440417A
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English (en)
Inventor
Hardy Rene
Maertelaere Pierre De
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Individual
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Individual
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves

Definitions

  • radio direction finders constructed for op-. erating with ultra short waves one is limited to considering finders that have (my one winding turn for each stator and likewise, .only'one winding turn for each rotor. It thus becomes impossible toemploy a suitable distribution of the winding turns for correcting errors of variation in the current induced in the rotor'at'its various angular positions with respect to the above-mentioned reference plane.
  • Y 1" One of the objects of the, present invention is consequently that of providing radio direction finders which do nothave'errors of this kind in the variation of the current induced in the rotor.
  • the rotor of an ultra short wave radio direction finder or other'inductive coupling device consists of two out-of-true surfaces having a symmetry with respect to a point, a straight line or a plane surface, and of such a shape that the voltages tapped at this rotors terminals vary according tothe desired sinusoidal law.
  • an ultrashort wave induction finder or distributor comprises two orthogonal plane winding turns which serve as statorsgandja rotor which consists of two diametral hemispherical zones assemwith a reciprocal angular displacement of Theinventio'n will be'explained in the following description given with reference to the appended drawinga in which:
  • Fig. 1 illustrates schematically one example of the arrangement of an ultra short ware'radio direction finder.
  • Fig. 2 illustrates schematically an ultra short wave inductivefinder or distributor which is specially suitable for the radio direction findin arrangement of Fig. 1.
  • Fig. 3 is a diagram that shows which the rotor of the finder-of Fig. 2 brings about an octantal error of .the induced current
  • Fig. 5 in perspective, and Fig. ,6 in plan View, illustrate a stator of an ultra short wave finder, together with diagrams of the respective fields
  • Fig. 7 shows variation curves of the current induced in the rotor of an ultra short wave finder
  • Figs. 8 to -10 illustrate one example-of an em- 5 bodiment of a rotor of an ultra short wave-finder that makes use of features of the invention.
  • an ultra short wave radio direction finders receiver may comprisetwo aerial assemblies 1 and 2 disposed atv 90 from each other and connected to the orthogonal stators l3 and [4 of a finder 15.
  • the rotor I5 is connected by any suitable connecting means, e g.
  • a graduated dial 9 which moves over a stationary index 10 permits manual actuation of the finders rotor 6.
  • This drive may also be effected continuously by means of a motor II.
  • the rotor of the finder 5 is tuned by means of a variable condenser J2, and the rotor B-condenser l2 assembly serves ,as input circuit for the receiver 8, thus making 'it possible to avoid losses in the transmission of energy from the aerials I and2 to the receiver 8.
  • the stators consist of single winding turns I-3 and M (Fig. 2') positioned in perpendicular planes and respectively connected to the stationary aerials.
  • The-rotor likewise consists of a bled with their segments staggered;by.9 0" (i. e. 5
  • Fig-5 gives a perspective view in two perpendicular planes of the two winding turns I3 and M which form the stators of the finder. These two turns are connected to the aerials I, I and 2, 2 which consist, for example, of two orthogonal dipoles located in an unencumbered place where the propagation is uniform.
  • the direction of the field with respect to one of the aerials e. g. is indicated at 29, the angle of this direction with respect to the aerial being 0.
  • Imax is the current in the aerials I, I, and consequently in-the winding turn I3, when the Wavecomes into the plane of the aerials, the current in the turn I3 (I13) becomes for the represented'direction of the field:
  • 036 is the direction of the field resulting from the vectorial addition of the fields created by the ourrents I13 and I14.
  • the orientation of the rotor accordingly makes it possible to ascertain the point of zero reception, i. e. the minimum andmaximum of reception, which should be at from each other.
  • phase relation between the currents of the antennas is of great importance and, for this purpose, the transmission line leading from the aerials to the rotors two winding turns, and also the rotor and the aerials themselves, have to be constructed in strictly symmetrical fashion.
  • the field within the windings of the stators must be uniform. Even if the field reproduced by the two winding turns may be considered as a reproduction of the field of space, it is not necessarily uniform. This lack of uniformity becomes all the more apparent the more one departs from the shape of a long solenoid in constructing the stators, and this is the case in short wave finders that have stators consisting of only two winding turns, as this brings about a distortion of the field.
  • a rotor that consists of a single winding turn rotating within the two winding turns of the stators will not indicate the precise directions for various reasons, first of all on account of the shape of the field, and also on account of the capacities resulting from variations in the coupling of the rotor to the stators, these being all the greater because it is necessary to select diameters as close as possible for the winding turns of the stators and the rotor in order to insure efiicient coupling.
  • the rotors indications can accordingly only be correct when the rotor is in the plane of one of the stators and in the bisector planes. For the other positions, there will be a coupling error or octantal error, e. g. like the one shown in the curve of Fig. 4.
  • this electromotive force is represented by the vector whose end describes a circle 22 tangential at to the plane E normal to the direction of propagation for a complete rotation of the rotor, this corresponds to the complete diagram 2223 of the classic figure of 8 shape of radio direction finders.
  • the present invention consequently provides for the construction of rotors for short wave radio direction finders which have stators that each consist of a single winding turn, byiziing use of an out-of-true winding turn that is suitably deformed in order to maintain the above mentioned sinusoidal relation. Furthermore, in order to insure efficient coupling between the stator and the rotor, another feature of the invention provides particularly for the use of a rotor that consists of an out-of-true surface' that is symmetrical with respect to a plane surface, a straight line or a point, that has dimensions substantially equal to those of the stators, and that maintains the said sinusoidal relation.
  • Figs. 8 to 10 illustrate one example of an embodiment of a stator for ultra short wave finders that makes use of features of the invention.
  • the rotor shown in these figures consists of two hemispherical metallic shells 30 and 3
  • connection wires 35 and 36 are soldered at the point diametrically opposite to the connection 34.
  • a rotor of this kind which is strongly coupled by mutual induction to two perpendicular stators 31 and 38 (Fig. 10) that each consist of one plane winding turn, is traversed during its rotation by an induced current having a substantially sinusoidal shape like that shown at 28 in Fig. '7, taking into account the distance between the stators and the rotor.
  • staggered segments will depend on the desired coupling bet-ween the rotor and the stators.
  • the uses to which the invention may be applied are not limited as above mentioned to radio direction finding; for example, the invention may also be used in the construction of progressive or any other kind of attenuators for determination of the output or input current of a generating or oscillatinginstnument, or even of an amplifier.
  • a radio goniometer coil assembly comprising two orthogonal plane winding turns forming a stator and a rotor in coupling relation therewith consisting of two electrically connected diametral hemispherical zone portions each consisting of opposite segments assembled with the segments of the respective zone portions in 90 angular relation whereby the current induced in the rotor will remain sinusoidal with the elimination of octantal errorsand circuit connections to the stator and to the rotor segments.
  • a radio goniometer coil assembly comprising two orthogonal plane winding turns forming a stator and a rotor in coupling relation therewith consisting of two electrically connected, diametral and substantially hemispherical zone portions each consisting of opposite segments and having side portions cut away and assembled with the segments of the respective zone portions in 90 angular relationwhereby the current I induced in the rotor will remain sinusoidal with the elimination of octantal errors and. circuit connections to the stator and to the rotor, substantially as described.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Near-Field Transmission Systems (AREA)
US440417A 1941-07-05 1942-04-24 Ultra high frequency wave coupling device Expired - Lifetime US2383857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2383857X 1941-07-05

Publications (1)

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US2383857A true US2383857A (en) 1945-08-28

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US440417A Expired - Lifetime US2383857A (en) 1941-07-05 1942-04-24 Ultra high frequency wave coupling device

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US (1) US2383857A (en))
BE (1) BE446307A (en))
FR (1) FR959702A (en))
NL (1) NL59273C (en))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460798A (en) * 1944-05-13 1949-02-08 Thomas O Mccarthy Radio direction finder
US2464029A (en) * 1945-04-07 1949-03-08 Gen Electric Method of making transformers
US2472106A (en) * 1943-09-20 1949-06-07 Sperry Corp Broad band antenna

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472106A (en) * 1943-09-20 1949-06-07 Sperry Corp Broad band antenna
US2460798A (en) * 1944-05-13 1949-02-08 Thomas O Mccarthy Radio direction finder
US2464029A (en) * 1945-04-07 1949-03-08 Gen Electric Method of making transformers

Also Published As

Publication number Publication date
NL59273C (en))
FR959702A (en)) 1950-04-04
BE446307A (en))

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